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Coefficient of Restitution :: Discussion
| 5. | If a machine is lubricated with oil? | |
| A. | The mechanical advantage of the machine increases | |
| B. | The mechanical efficiency of the machine increases | |
| C. | Both its mechanical advantage and efficiency increases | |
| D. | Its efficiency increases, but its mechanical advantage decreases | |
| Answer: Option B | |
| Explanation: | |
|
When a machine is lubricated with oil, energy wastage against friction decreases. This increases the mechanical efficiency of the machine. |
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